EP2468560A1 - Fuel system - Google Patents
Fuel system Download PDFInfo
- Publication number
- EP2468560A1 EP2468560A1 EP11009838A EP11009838A EP2468560A1 EP 2468560 A1 EP2468560 A1 EP 2468560A1 EP 11009838 A EP11009838 A EP 11009838A EP 11009838 A EP11009838 A EP 11009838A EP 2468560 A1 EP2468560 A1 EP 2468560A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fuel
- venting
- fuel tank
- valve
- pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 203
- 239000002828 fuel tank Substances 0.000 claims abstract description 80
- 238000013022 venting Methods 0.000 claims abstract description 57
- 239000007788 liquid Substances 0.000 claims abstract description 29
- 238000011144 upstream manufacturing Methods 0.000 claims description 5
- 239000012530 fluid Substances 0.000 abstract description 2
- 238000000926 separation method Methods 0.000 description 17
- 238000002485 combustion reaction Methods 0.000 description 12
- 238000011161 development Methods 0.000 description 9
- 238000003860 storage Methods 0.000 description 7
- 238000009423 ventilation Methods 0.000 description 7
- 238000005265 energy consumption Methods 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 230000010354 integration Effects 0.000 description 2
- 238000012432 intermediate storage Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 210000003746 feather Anatomy 0.000 description 1
- 239000003502 gasoline Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
- B60K15/03—Fuel tanks
- B60K15/035—Fuel tanks characterised by venting means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M33/00—Other apparatus for treating combustion-air, fuel or fuel-air mixture
- F02M33/02—Other apparatus for treating combustion-air, fuel or fuel-air mixture for collecting and returning condensed fuel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M33/00—Other apparatus for treating combustion-air, fuel or fuel-air mixture
- F02M33/02—Other apparatus for treating combustion-air, fuel or fuel-air mixture for collecting and returning condensed fuel
- F02M33/08—Other apparatus for treating combustion-air, fuel or fuel-air mixture for collecting and returning condensed fuel returning to the fuel tank
Definitions
- the invention relates to a fuel system, in particular of a motor vehicle, with a fuel tank and a venting device for venting the fuel tank, wherein the venting device has at least one separator for liquid fuel having a separating device and designed as a suction jet fuel delivery device for conveying fuel from the buffer.
- Fuel systems of the type mentioned are known from the prior art. They are associated, for example, with a motor vehicle or a drive system of the motor vehicle.
- the drive system has at least one internal combustion engine and is designed, for example, as a hybrid drive system, thus has the internal combustion engine and at least one electric machine, the internal combustion engine and the electric machine generating a drive torque of the drive system at least temporarily together.
- the internal combustion engine is supplied by the fuel system fuel from the fuel tank.
- Frequently used as fuel is a volatile hydrocarbon fuel, for example gasoline.
- the fuel tank therefore normally contains both a volume of liquid fuel and a volume of gaseous fuel, which is obtained in particular above the liquid fuel.
- the fuel tank may be a closed tank, in particular a pressure tank, or a partially closed, in particular also pressureless, tank. The closed tank is used in particular to reduce emissions.
- the venting device Due to variations in the temperature of the fuel, caused for example by changes in the ambient temperature, pressure fluctuations in the fuel tank can occur. For this reason, the venting device is associated with the fuel tank. It serves to vent the fuel tank. In this way, too high a pressure in the fuel tank can be reduced by the venting device.
- the venting device vents the fuel tank, for example by a vent line.
- gaseous as well as liquid fuel can escape from the fuel tank through the venting device or the venting line.
- the vented fuel is thus initially present as a mixture of gaseous and liquid fuel. This is especially the case Case when venting the fuel tank is performed at high fuel tank internal pressure. In this case, due to the high pressure or the large pressure difference between the fuel tank internal pressure and the pressure outside of the fuel tank, high flow velocities of the vented fuel are present, as a result of which liquid fuel is entrained by the gaseous fuel.
- the gaseous fuel may readily be supplied to the internal combustion engine or its intake system, wherein between the fuel tank and the internal combustion engine, a venting device associated fuel storage, which is preferably designed as activated carbon storage, may be arranged.
- the fuel storage is used to cache gaseous fuel, so absorb when not needed gaseous fuel is present and deliver as soon as the gaseous fuel can be discharged into the engine. However, no liquid fuel may enter the fuel accumulator or the internal combustion engine.
- the venting device has the at least one separating device, which serves for the separation of gaseous and liquid fuel.
- the separating device is therefore intended to prevent the transfer of liquid fuel from the fuel tank through the venting device into the internal combustion engine or the fuel storage.
- the separation device deposits liquid fuel and allows gaseous fuel to pass.
- the separated liquid fuel passes into the buffer of the separator.
- the term buffer does not mean that an actual (intermediate) storage of the liquid fuel is provided. Rather, the liquid fuel can be discharged directly from the buffer or the separating device, preferably in the direction of the fuel tank. In this case, however, an increase in the fill level of the intermediate store can result, for example, due to a limitation of the discharge volume flow, in particular through a line cross section or the like.
- the separated liquid fuel can therefore be removed at least temporarily not as fast as it is introduced into the buffer.
- an intermediate storage of the liquid fuel for example over a certain period of time, can be realized.
- the level of the buffer accordingly, becomes larger than a limit level, because it may affect the efficiency of the separator.
- the greater the amount of liquid fuel in the intermediate storage the greater the risk that, together with the gaseous fuel, liquid fuel also comes out of the separation device again and is taken along in the direction of the fuel accumulator or of the internal combustion engine.
- the separating device can be assigned to the fuel delivery device. This is used to convey liquid fuel from the buffer, especially in the direction of the fuel tank.
- the fuel delivery device is usually designed as a suction jet pump, being often used as the operating means of the suction jet pump fuel, which is supported by a fuel pump of the fuel system from the fuel tank in the direction of the internal combustion engine.
- This means that the suction jet pump is always in operation as soon as the fuel pump is operated. Accordingly, the suction jet pump is also operated when there is no liquid fuel in the buffer. For this reason, the energy consumption of the fuel systems known from the prior art is very high.
- a pressure-reducing member or a pressure-adjusting member in a service line of the suction jet pump.
- the suction jet pump is supplied with the operating medium, that is, for example, fuel conveyed by the fuel pump.
- the operating medium line is therefore usually designed as a resource supply line.
- the pressure reducing member or the Druckeinstellglied should be present. Both with the pressure reducing member and the Druckeinstellglied a reduction of the operating medium pressure of the suction jet pump can be realized.
- the pressure reducing member the pressure change is generated at any time, while the pressure change is adjustable when the Druckeinstellglied is provided.
- the Druckeinstellglied is also adjustable so that no pressure reduction or pressure reduction takes place.
- the setting of the operating medium pressure by means of the Druckeinstellglieds or adjusting the Druckeinstellglieds preferably takes place in dependence on a present at an output of a fuel pump fuel pressure or the fuel tank internal pressure. The latter is particular provided in the presence of a pressure tank.
- the operation of the suction jet pump can thus be carried out such that in a first mode, a first operating medium pressure is provided, which is different from a second operating medium pressure in a second mode.
- the operating medium line can be completely closed or interrupted by means of the pressure setting member. This means that the suction jet pump can be put out of operation even when the fuel pump is running, so that there is no delivery of liquid fuel from the buffer. In this way, a particularly significant reduction in the energy consumption of the fuel system is achieved.
- the venting device has at least one venting valve for venting the fuel tank through the venting device. It can now be provided that the suction jet pump is only in operation and / or for a certain period of time after actuation of the vent valve in operation. Accordingly, fuel is only conveyed from the intermediate store, while the fuel tank is vented, and thus liquid fuel can accumulate in the intermediate store.
- the fuel delivery device is assigned an actuating device, in particular having at least one electromagnet.
- the actuating device serves to actuate the fuel delivery device for conveying fuel from the buffer.
- the actuating device is preferably an electrical actuating device which is operable independently of the fuel pump of the fuel system.
- the actuating device can have at least one electromagnet.
- a development of the invention provides that both the fuel delivery device as well as a vent valve for venting of the fuel tank by the venting device be operated by the actuator, in particular separately or together.
- the vent valve is assigned to the venting device.
- the bleed valve may be adjusted to open the vent of the fuel tank or to close the vent. It is available, for example, as FTIV (Fuel Tank Isolation Valve).
- the vent valve may be formed as a clock valve, which allows setting of discrete switching states (open and closed).
- the vent valve is designed as a continuous valve, which not only allows the discrete switching states, but allows adjusting the flow cross-section in several stages, particularly preferably a continuous adjustment allows. In this way, the volume flow through the separation device, in particular continuously, controlled and / or regulated adjustable.
- the vent valve may be integrated with the separation device or the fuel delivery device. The vent valve can therefore be present modularly integrated into the fuel delivery device.
- Both the fuel delivery device and the venting valve should be operable by the actuator.
- the actuator is so far as a common actuator before, so that a single actuator is sufficient to actuate both the fuel conveyor and the vent valve.
- the venting valve is integrated with the fuel delivery device, that is, as a common component.
- an integration of the actuating device with the vent valve and the fuel delivery device is preferably provided.
- the operation can be provided separately or together. In the former case, either the fuel delivery device or the venting valve can be controlled separately from the respective other element by means of the actuating device. In the latter case takes place by means of the actuating device, a simultaneous operation of both the fuel delivery device and the vent valve.
- both the fuel delivery device for conveying fuel from the buffer can be actuated with the common actuating device, as well as the venting of the fuel chamber are effected by means of the vent valve.
- Particularly preferred in this case is the integration of fuel delivery device, venting valve and actuating device, because thus with a single component, which is present at least partially in the separation device, both the venting of the fuel tank and the emptying of the buffer are possible.
- a development of the invention provides that the actuating device for performing an actuating movement in a first direction and the first direction opposite second direction and / or a first stroke and a second, larger stroke is controlled, wherein the implementation of the actuating movement in the first direction or around the first stroke, the fuel delivery device and / or the vent valve and the implementation of the actuating movement in the second direction or the second stroke the vent valve and / or the fuel delivery device actuate.
- the actuating device is accordingly provided for carrying out the actuating movement in two directions and in a second embodiment for carrying out the actuating movement with two different strokes.
- the actuator may be formed as a common actuator for both the fuel delivery device and the vent valve, but allow a separate, so not simultaneous, actuation of fuel delivery and vent valve.
- a development of the invention provides that fuel is provided from the fuel tank as operating means of the suction jet pump, which fuel can be conveyed by means of a fuel pump in the direction of the suction jet pump and a fuel outlet of the fuel system.
- the fuel pump therefore serves to provide the operating medium pressure of the suction jet pump.
- the fuel pump and the suction jet pump are fluidly connected to each other via the operating medium line.
- the pressure reducing member or the Druckeinstellglied are therefore fluidically in front of the fuel pump and the ejector.
- the fuel pump serves to deliver fuel toward the fuel outlet of the fuel system.
- the fuel outlet is associated, for example, with a utility machine, in particular with the internal combustion engine.
- a development of the invention provides that the operation of the suction jet pump is provided in a first operating mode with a first operating medium pressure, which is different from a second operating medium pressure in a second operating mode, wherein the fuel at an output of the fuel pump in the first and the second mode present with the second operating medium pressure.
- the fuel is thus conveyed out of the fuel tank by means of the fuel pump and brought to the second operating medium pressure, which is present at the output of the fuel pump.
- the fuel is provided at the fuel outlet at the second operating medium pressure for the utility machine.
- the operating medium pressure of the suction jet pump ie the first operating medium pressure, deviates from the second operating medium pressure, in particular is lower.
- a further development of the invention provides that the pressure reducing member or the Druckeinstellglied is fluidly provided between the output of the fuel pump and the suction jet pump.
- the pressure reduction from the second operating medium pressure present at the outlet of the fuel pump to the first operating medium pressure used to operate the ejector pump should therefore be present between the output of the fuel pump and a working fluid inlet of the ejector pump.
- the pressure reducing member is a throttle or Druckeinstellglied a Querterrorismsverstellglied, in particular a cascade switch is.
- the throttle should have a constant flow cross section, while the flow cross section of the Querterrorismsverstellglieds is adjustable. In particular, it is also provided to adjust the flow cross-section such that the operating medium line is interrupted or completely released.
- the Querterrorismsverstellglied can be present for example as a cascade switch. This is designed such that it releases or obstructs a specific flow cross-section as a function of a pressure applied to an input, in particular the second operating medium pressure.
- a further development of the invention provides that the at least one venting valve for venting the fuel tank by the separating device is connected upstream or downstream of this.
- the fuel must therefore always pass through the vent valve for a flow through the separator.
- the venting valve of the separation device downstream of flow alternatively, however, it may be upstream of this.
- a further development of the invention provides that the separation device is preceded by at least one ventilation valve switching in dependence on the fuel tank level and / or at least one safety valve associated with the fuel tank.
- the ventilation valve is designed in particular as FLVV (Fill Limit Venting Valve). Such allows venting of the fuel tank as long as the fuel tank level is less than a particular fuel tank level, in particular Fuel tank maximum level.
- the ventilation valve thus ensures ventilation of the fuel tank, in particular when fuel is supplied to the fuel tank.
- the safety valve may be provided, which is designed for example as a rollover safety valve or ROV (roll over valve). Both the ventilation valve and the safety valve are usually associated with the fuel tank and upstream of the separation device, so that the fuel first passes through the ventilation valve or the safety valve before it enters the separation device.
- the invention also relates to a drive system with a fuel system according to the above.
- the drive system in particular has at least one internal combustion engine and is designed, for example, as a hybrid drive system.
- the FIG. 1 shows a schematic representation of a fuel system 1.
- the fuel system 1 is for example part of a motor vehicle or a drive system of the motor vehicle.
- the fuel system 1 has a fuel tank 2 and a venting device 3 for venting the fuel tank 1.
- the venting device 3 has a separating device 4 with a buffer 5.
- the separation device 4 serves to separate liquid fuel from a mixture of liquid and gaseous fuel.
- the separated liquid fuel is then present in the buffer 5 and can, for example, by a return line 6, are fed back to the fuel tank 2.
- the return line 6 preferably has a valve, in particular a drainage valve or check valve.
- valve instead of the return line 6 can also only the valve may be provided, in particular if the separation device 4 is present in the fuel tank 2 at least in regions, so that fuel exiting through the valve from the buffer 5 passes directly into the fuel tank.
- the valve is designed such that fuel can only pass out of the buffer 5 through the return line 6, but can not get into it. This prevents fuel from the fuel tank 2 from entering the buffer 5 through the return line 6.
- the venting device 3 is connected via a vent line 7 in flow communication with the fuel tank 2.
- a vent valve 8 is provided which switches depending on the fuel tank level.
- the vent valve 8 is designed such that it is open only at a fuel tank level below a certain fuel tank level, in particular a maximum fuel tank level, so fuel, in particular gaseous fuel, can get from the fuel tank into the vent line 7.
- the vent line 7 opens into the buffer 5 of the separator 4, preferably through a bottom 9 of the buffer 5.
- an outlet 10 opens into the buffer 5, preferably through a ceiling 11 of the Intermediate store 5.
- the discharge point of the outlet line 10 into the intermediate store 5 is thus preferably arranged such that only gaseous fuel can pass from the intermediate store 5 into the outlet line 10.
- the mouth points of outlet line 10 and vent line 7 are preferably arranged on opposite sides of the intermediate store 5.
- the outlet line 10 has a vent valve 12, which can be actuated by means of an actuating device 13.
- the vent valve 12 and the actuator 13 are preferably designed such that the flow cross-section of the vent valve 12 is continuously adjustable.
- the outlet line 10 opens into a fuel reservoir 14, in particular an activated carbon reservoir.
- the fuel accumulator 14 serves for the temporary storage of gaseous fuel.
- the separation device 4 is usually at least partially, in particular completely, arranged in the fuel tank 2. However, an arrangement outside of the fuel tank 2 is possible. Alternatively, the separation device 4 can also be integrated into a conduit, for example the ventilation conduit 7. In a preferred embodiment, the separation device is designed such that it or the venting device 3 has a certain pressure loss. This is chosen such that when venting the fuel tanks 2 by means of the venting device 3, any existing valve, such as the vent valve 8, is not brought into its closed position.
- the vent valve 8 usually has a float which releases a valve seat of the vent valve 8 as long as the fuel tank level is less than a certain fuel tank level.
- the float can be displaced from the volumetric flow or the vented fuel into the valve seat, ie into the closed position, so that a further venting of the fuel tank 2 not possible. This applies in particular when the vent valve 12 is fully open.
- the pressure loss of the venting device 3 is adjusted by adjusting the venting valve 12, for example by introducing a throttle element.
- the pressure loss of the venting device 3 by adjusting the separation device 4 or the pressure loss takes place, for example by providing an adapted throttle element.
- the vent valve 12 therefore preferably has no throttle element.
- the throttle element may of course be additionally provided.
- the separation device 4 has a fuel delivery device 15, which is designed as a suction jet pump 16.
- the suction jet pump 16 has a service line 17 and suction line 18.
- the operating medium line 17 is flowed through by operating means.
- the suction line 18 opens into an area in the operating line 17, in which the latter has a sectionally reduced cross-section, so that, for example, a Venturi nozzle is present.
- the suction line 18 opens into the buffer 5 in such a way that its mouth is arranged in a region in which usually liquid fuel is present in the buffer 5. Accordingly, the mouth of the suction line 18 will usually be arranged in the region of the bottom 9.
- the operating line 17 is connected to a fuel pump 19, which is assigned to the fuel tank 2 and serves to deliver fuel from the fuel tank 2.
- the fuel pump 19 is provided to supply the fuel both in the direction of a fuel outlet 20 of the fuel system 1 and in the direction of the suction jet pump 16 promote. Accordingly, both the operating medium line 17 and the fuel outlet are fluidically connected to an output 21 of the fuel pump 19.
- a Druckeinstellglied 22 is provided, which may be present either as a discrete valve or as a continuous valve.
- the Druckeinstellglied 23 is insofar as before Querterrorismsverstellglied.
- the Druckeinstellglied 22 serves to interrupt the resource line 17 or release for a flow with the funded by the fuel pump 19 fuel.
- the Druckeinstellglied 23 formed as a continuous valve it may additionally be provided that a first, applied to the ejector 16 operating medium pressure controlled and / or regulated adjustable, while at the output 21 of the fuel pump 19, there is a second operating medium pressure.
- the first operating medium pressure may be selected as a function of the pressure present at the outlet 21 and / or the fuel tank internal pressure.
- both the Druckeinstellglied 22 and the vent valve 12 can be actuated by means of the actuator 13.
- the actuator 13 is insofar as a common actuator ago.
- the actuating device 13 may be designed, for example, to carry out actuating movements in a first direction and in a second direction opposite to the first direction.
- the actuating device 13 may also be provided for carrying out the actuating movements about a first stroke or about a second, larger stroke.
- the actuating device 13 may be designed only for a common and simultaneous actuation of the vent valve 12 and the fuel delivery device 15.
- the resource line 17 is released by the Druckeinstellglieds 22 only when a venting of the fuel tank 2 by means of the vent valve 12, so that only in this case, the fuel delivery device 15 for conveying fuel from the buffer 5 in the direction of the fuel tank 2 operated becomes. In this way, the operation of the suction jet pump 16 and the fuel delivery device 15 only if this is actually necessary. In this way, the energy consumption of the fuel delivery device 15 and thus of the fuel system 1 can be reduced compared to systems known from the prior art.
- the FIG. 2 shows a further embodiment of the fuel system 1.
- the structure of the in the FIG. 2 shown fuel system 1 corresponds essentially to the basis of FIG. 1 described, so that reference is made to the above statements.
- the Druckeinstellglied 22 is designed as a passive Querterrorismsverstellglied, in particular as a cascade switch 23.
- the cascade switch 23 sets a specific flow cross-section as a function of the second operating medium pressure generated by the fuel pump 19 and thus the first operating medium pressure applied to the suction jet pump 16.
- FIG. 3 shows the cascade switch 23. It is clear that the cascade switch 23 consists of a cylinder 24 and a longitudinally movably mounted piston 25 therein. At an input 26 of the cascade switch 23, the second operating medium pressure is present, the input 26 is therefore fluidly connected to the fuel pump. The force exerted on the piston 25 by the second operating medium pressure counteracts a spring force generated by a spring 27. The spring force 27 pushes the extent of the piston 25 in the direction of the input 26. The higher the second operating medium pressure, the more the piston 25 is urged in the direction of the spring 27 and this compresses it.
- operating means can enter a second chamber 30 from a first chamber 29, which is flow-connected to the inlet 26.
- the chambers 29 and 30 are otherwise separated from the piston 25 from each other.
- the second chamber 30 is connected to an output 31 and this with the suction jet pump 16 fluidly connected. From the FIG. 3 It is clear that a flow cross-section 32 of the output 31 is the more obscured by the piston 25, the further it is urged in the direction of the spring 27.
- the flow cross-section 33 is therefore the smaller, the higher the voltage applied to the input 26 second operating medium pressure. In this way, a passive adjustment of the first operating medium pressure, which is applied to the suction jet pump 16, achieved in dependence on the second operating medium pressure. If the fuel tank 2 is a pressure tank, then the second operating medium pressure may correspond to the fuel tank internal pressure.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Transportation (AREA)
- Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Die Erfindung betrifft ein Kraftstoffsystem, insbesondere eines Kraftfahrzeugs, mit einem Kraftstofftank und einer Entlüftungseinrichtung zur Entlüftung des Kraftstofftanks, wobei die Entlüftungseinrichtung über zumindest eine einen Zwischenspeicher für flüssigen Kraftstoff aufweisende Abscheidevorrichtung und eine als Saugstrahlpumpe ausgebildete Kraftstofffördereinrichtung zur Förderung von Kraftstoff aus dem Zwischenspeicher verfügt.The invention relates to a fuel system, in particular of a motor vehicle, with a fuel tank and a venting device for venting the fuel tank, wherein the venting device has at least one separator for liquid fuel having a separating device and designed as a suction jet fuel delivery device for conveying fuel from the buffer.
Kraftstoffsysteme der eingangs genannten Art sind aus dem Stand der Technik bekannt. Sie sind beispielsweise einem Kraftfahrzeug beziehungsweise einem Antriebssystem des Kraftfahrzeugs zugeordnet. Das Antriebssystem verfügt dabei insbesondere über zumindest eine Brennkraftmaschine und ist beispielsweise als Hybridantriebssystem ausgebildet, weist also die Brennkraftmaschine sowie zumindest eine elektrische Maschine auf, wobei die Brennkraftmaschine und die elektrische Maschine ein Antriebsmoment des Antriebssystems zumindest zeitweise gemeinsam erzeugen. Der Brennkraftmaschine wird von dem Kraftstoffsystem Kraftstoff aus dem Kraftstofftank zugeführt. Häufig wird als Kraftstoff ein flüchtiger Kohlenwasserstoffkraftstoff, beispielsweise Benzin, verwendet. Der Kraftstofftank enthält daher normalerweise sowohl ein Volumen an flüssigem Kraftstoff als auch ein Volumen an gasförmigem Kraftstoff, welches insbesondere oberhalb des flüssigen Kraftstoffs anfällt. Der Kraftstofftank kann ein geschlossener Tank, insbesondere ein Drucktank, oder ein teilgeschlossener, insbesondere auch druckloser, Tank sein. Der geschlossene Tank wird insbesondere zur Reduzierung von Emissionen verwendet.Fuel systems of the type mentioned are known from the prior art. They are associated, for example, with a motor vehicle or a drive system of the motor vehicle. In particular, the drive system has at least one internal combustion engine and is designed, for example, as a hybrid drive system, thus has the internal combustion engine and at least one electric machine, the internal combustion engine and the electric machine generating a drive torque of the drive system at least temporarily together. The internal combustion engine is supplied by the fuel system fuel from the fuel tank. Frequently used as fuel is a volatile hydrocarbon fuel, for example gasoline. The fuel tank therefore normally contains both a volume of liquid fuel and a volume of gaseous fuel, which is obtained in particular above the liquid fuel. The fuel tank may be a closed tank, in particular a pressure tank, or a partially closed, in particular also pressureless, tank. The closed tank is used in particular to reduce emissions.
Bedingt durch Schwankungen der Temperatur des Kraftstoffs, beispielsweise verursacht durch Veränderungen der Umgebungstemperatur, können Druckschwankungen in dem Kraftstofftank auftreten. Aus diesem Grund ist die Entlüftungseinrichtung dem Kraftstofftank zugeordnet. Sie dient der Entlüftung des Kraftstofftanks. Auf diese Weise kann ein zu hoher Druck in dem Kraftstofftank durch die Entlüftungseinrichtung reduziert werden. Zu diesem Zweck entlüftet die Entlüftungseinrichtung den Kraftstofftank beispielsweise durch eine Entlüftungsleitung. Bei dem Entlüften kann durch die Entlüftungseinrichtung beziehungsweise die Entlüftungsleitung sowohl gasförmiger als auch flüssiger Kraftstoff aus dem Kraftstofftank heraus gelangen. Der entlüftete Kraftstoff liegt also zunächst als Gemisch aus gasförmigem und flüssigem Kraftstoff vor. Dies ist insbesondere dann der Fall, wenn das Entlüften des Kraftstofftanks bei hohem Kraftstofftankinnendruck durchgeführt wird. Dabei liegen, bedingt durch den hohen Druck beziehungsweise die große Druckdifferenz zwischen Kraftstofftankinnendruck und dem Druck außerhalb des Kraftstofftanks hohe Strömungsgeschwindigkeiten des entlüfteten Kraftstoffs vor, wodurch flüssiger Kraftstoff von dem gasförmigen Kraftstoff mitgerissen wird.Due to variations in the temperature of the fuel, caused for example by changes in the ambient temperature, pressure fluctuations in the fuel tank can occur. For this reason, the venting device is associated with the fuel tank. It serves to vent the fuel tank. In this way, too high a pressure in the fuel tank can be reduced by the venting device. For this purpose, the venting device vents the fuel tank, for example by a vent line. During the venting, gaseous as well as liquid fuel can escape from the fuel tank through the venting device or the venting line. The vented fuel is thus initially present as a mixture of gaseous and liquid fuel. This is especially the case Case when venting the fuel tank is performed at high fuel tank internal pressure. In this case, due to the high pressure or the large pressure difference between the fuel tank internal pressure and the pressure outside of the fuel tank, high flow velocities of the vented fuel are present, as a result of which liquid fuel is entrained by the gaseous fuel.
Der gasförmige Kraftstoff darf ohne weiteres der Brennkraftmaschine beziehungsweise deren Ansaugsystem zugeführt werden, wobei zwischen dem Kraftstofftank und der Brennkraftmaschine ein der Entlüftungseinrichtung zugeordneter Kraftstoffspeicher, welcher bevorzugt als Aktivkohlespeicher ausgebildet ist, angeordnet sein kann. Der Kraftstoffspeicher dient dazu, gasförmigen Kraftstoff zwischenzuspeichern, also aufzunehmen, wenn nicht benötigter gasförmiger Kraftstoff vorliegt und abzugeben, sobald der gasförmige Kraftstoff in die Brennkraftmaschine abgeführt werden kann. Es darf jedoch kein flüssiger Kraftstoff in den Kraftstoffspeicher beziehungsweise die Brennkraftmaschine gelangen.The gaseous fuel may readily be supplied to the internal combustion engine or its intake system, wherein between the fuel tank and the internal combustion engine, a venting device associated fuel storage, which is preferably designed as activated carbon storage, may be arranged. The fuel storage is used to cache gaseous fuel, so absorb when not needed gaseous fuel is present and deliver as soon as the gaseous fuel can be discharged into the engine. However, no liquid fuel may enter the fuel accumulator or the internal combustion engine.
Aus diesem Grund weist die Entlüftungseinrichtung die zumindest eine Abscheidevorrichtung auf, welche zur Trennung von gasförmigem und flüssigem Kraftstoff dient. Die Abscheidevorrichtung ist demnach dazu vorgesehen, das Überführen von flüssigem Kraftstoff von dem Kraftstofftank durch die Entlüftungseinrichtung in die Brennkraftmaschine beziehungsweise den Kraftstoffspeicher zu verhindern. Dabei scheidet die Abscheidevorrichtung flüssigen Kraftstoff ab und lässt gasförmigen Kraftstoff passieren. Der abgeschiedene flüssige Kraftstoff gelangt in den Zwischenspeicher der Abscheidevorrichtung. Der Begriff Zwischenspeicher bedeutet dabei nicht, dass tatsächlich eine (Zwischen-) Speicherung des flüssigen Kraftstoffs vorgesehen ist. Vielmehr kann der flüssige Kraftstoff unmittelbar aus dem Zwischenspeicher beziehungsweise der Abscheidevorrichtung abgeführt werden, bevorzugt in Richtung des Kraftstofftanks. Dabei kann sich jedoch, beispielsweise durch eine Begrenzung des Abführvolumenstroms, insbesondere durch einen Leitungsquerschnitt oder dergleichen, ein Anstieg des Füllstands des Zwischenspeichers ergeben. Der abgeschiedene flüssige Kraftstoff kann demnach zumindest zeitweise nicht so schnell abgeführt werden, wie er in den Zwischenspeicher eingebracht wird. Selbstverständlich ist auch eine Zwischenspeicherung des flüssigen Kraftstoffs, beispielsweise über eine bestimmte Zeitspanne, realisierbar.For this reason, the venting device has the at least one separating device, which serves for the separation of gaseous and liquid fuel. The separating device is therefore intended to prevent the transfer of liquid fuel from the fuel tank through the venting device into the internal combustion engine or the fuel storage. In this case, the separation device deposits liquid fuel and allows gaseous fuel to pass. The separated liquid fuel passes into the buffer of the separator. The term buffer does not mean that an actual (intermediate) storage of the liquid fuel is provided. Rather, the liquid fuel can be discharged directly from the buffer or the separating device, preferably in the direction of the fuel tank. In this case, however, an increase in the fill level of the intermediate store can result, for example, due to a limitation of the discharge volume flow, in particular through a line cross section or the like. The separated liquid fuel can therefore be removed at least temporarily not as fast as it is introduced into the buffer. Of course, an intermediate storage of the liquid fuel, for example over a certain period of time, can be realized.
Beim Betreiben des Kraftstoffsystems sollte verhindert werden, dass die sich in dem Zwischenspeicher beziehungsweise der Abscheidevorrichtung befindliche Menge des flüssigen Kraftstoffs eine Grenzmenge überschreitet, der Füllstand des Zwischenspeichers demnach größer als ein Grenzfüllstand wird, weil dies die Wirksamkeit der Abscheidevorrichtung beeinträchtigen kann. Je größer die Menge flüssigen Kraftstoffs in dem Zwischenspeicher ist, umso größer wird das Risiko, dass zusammen mit dem gasförmigen Kraftstoff auch flüssiger Kraftstoff wieder aus der Abscheidevorrichtung heraus gelangt und in Richtung des Kraftstoffspeichers beziehungsweise der Brennkraftmaschine mitgenommen wird. Aus diesem Grund kann der Abscheidevorrichtung die Kraftstofffördereinrichtung zugeordnet werden. Diese wird dazu eingesetzt, flüssigen Kraftstoff aus dem Zwischenspeicher zu fördern, insbesondere in Richtung des Kraftstofftanks. Die Kraftstofffördereinrichtung ist dabei üblicherweise als Saugstrahlpumpe ausgebildet, wobei als Betriebsmittel der Saugstrahlpumpe häufig Kraftstoff verwendet wird, welcher von einer Kraftstoffpumpe des Kraftstoffsystems aus dem Kraftstofftank in Richtung der Brennkraftmaschine gefördert wird. Das bedeutet, dass die Saugstrahlpumpe stets in Betrieb ist, sobald die Kraftstoffpumpe betrieben wird. Die Saugstrahlpumpe wird demnach auch dann betrieben, wenn in dem Zwischenspeicher kein flüssiger Kraftstoff ist. Aus diesem Grund ist der Energieverbrauch der aus dem Stand der Technik bekannten Kraftstoffsysteme sehr hoch.When operating the fuel system, it should be prevented that the amount of liquid fuel in the buffer or the separating device exceeds a limit amount, the level of the buffer accordingly, becomes larger than a limit level, because it may affect the efficiency of the separator. The greater the amount of liquid fuel in the intermediate storage, the greater the risk that, together with the gaseous fuel, liquid fuel also comes out of the separation device again and is taken along in the direction of the fuel accumulator or of the internal combustion engine. For this reason, the separating device can be assigned to the fuel delivery device. This is used to convey liquid fuel from the buffer, especially in the direction of the fuel tank. The fuel delivery device is usually designed as a suction jet pump, being often used as the operating means of the suction jet pump fuel, which is supported by a fuel pump of the fuel system from the fuel tank in the direction of the internal combustion engine. This means that the suction jet pump is always in operation as soon as the fuel pump is operated. Accordingly, the suction jet pump is also operated when there is no liquid fuel in the buffer. For this reason, the energy consumption of the fuel systems known from the prior art is very high.
Es ist demnach Aufgabe der Erfindung, ein Kraftstoffsystem vorzuschlagen, welches einen geringeren Energieverbrauch aufweist, wobei insbesondere eine Verringerung des Energieverbrauchs der Kraftstofffördereinrichtung beziehungsweise der Saugstrahlpumpe gegenüber aus dem Stand der Technik bekannten Kraftstoffsystemen realisiert ist.It is therefore an object of the invention to propose a fuel system which has a lower energy consumption, wherein in particular a reduction of the energy consumption of the fuel delivery device or the suction jet pump is realized compared to known from the prior art fuel systems.
Dies wird erfindungsgemäß erreicht, indem in einer Betriebsmittelleitung der Saugstrahlpumpe ein Druckminderungsglied oder ein Druckeinstellglied vorgesehen ist. Über die Betriebsmittelleitung wird der Saugstrahlpumpe das Betriebsmittel, also beispielsweise von der Kraftstoffpumpe geförderter Kraftstoff, zugeführt. Die Betriebsmittelleitung ist demnach üblicherweise als Betriebsmittelzuleitung ausgebildet. In der Betriebsmittelleitung soll nun das Druckminderungsglied beziehungsweise das Druckeinstellglied vorliegen. Sowohl mit dem Druckminderungsglied als auch dem Druckeinstellglied kann eine Reduzierung des Betriebsmitteldrucks der Saugstrahlpumpe realisiert werden. Mit dem Druckminderungsglied wird dabei zu jeder Zeit die Druckänderung erzeugt, während die Druckänderung einstellbar ist, wenn das Druckeinstellglied vorgesehen ist. Vorzugsweise ist das Druckeinstellglied dabei auch derart einstellbar, dass keine Druckreduzierung beziehungsweise Druckminderung erfolgt. Das Einstellen des Betriebsmitteldrucks mittels des Druckeinstellglieds beziehungsweise das Einstellen des Druckeinstellglieds erfolgt bevorzugt in Abhängigkeit von einem an einem Ausgang einer Kraftstoffpumpe vorliegenden Kraftstoffdruck oder dem Kraftstofftankinnendruck. Letzteres ist insbesondere bei Vorliegen eines Drucktanks vorgesehen. Mittels des Druckeinstellglieds kann der Betrieb der Saugstrahlpumpe folglich derart erfolgen, dass in einer ersten Betriebsart ein erster Betriebsmitteldruck vorgesehen ist, welcher von einem zweiten Betriebsmitteldruck in einer zweiten Betriebsart unterschiedlich ist. Durch die Druckreduzierung in zumindest einer Betriebsart des Kraftstoffsystems kann somit der Energieverbrauch der Saugstrahlpumpe und damit des Kraftstoffsystems gegenüber aus dem Stand der Technik bekannten Kraftstoffsystemen verringert werden.This is achieved according to the invention by providing a pressure-reducing member or a pressure-adjusting member in a service line of the suction jet pump. By means of the operating medium line, the suction jet pump is supplied with the operating medium, that is, for example, fuel conveyed by the fuel pump. The operating medium line is therefore usually designed as a resource supply line. In the operating line now the pressure reducing member or the Druckeinstellglied should be present. Both with the pressure reducing member and the Druckeinstellglied a reduction of the operating medium pressure of the suction jet pump can be realized. With the pressure reducing member, the pressure change is generated at any time, while the pressure change is adjustable when the Druckeinstellglied is provided. Preferably, the Druckeinstellglied is also adjustable so that no pressure reduction or pressure reduction takes place. The setting of the operating medium pressure by means of the Druckeinstellglieds or adjusting the Druckeinstellglieds preferably takes place in dependence on a present at an output of a fuel pump fuel pressure or the fuel tank internal pressure. The latter is particular provided in the presence of a pressure tank. By means of the Druckeinstellglieds the operation of the suction jet pump can thus be carried out such that in a first mode, a first operating medium pressure is provided, which is different from a second operating medium pressure in a second mode. As a result of the pressure reduction in at least one operating mode of the fuel system, the energy consumption of the ejector pump and thus of the fuel system can be reduced compared to fuel systems known from the prior art.
Weil zudem das Betriebsmittel nach dem Durchlaufen der Saugstrahlpumpe, eventuell zusammen mit aus dem Zwischenspeicher gefördertem flüssigen Kraftstoff wieder dem Kraftstofftank zugeführt wird und durch die Druckreduzierung die Geschwindigkeit, mit welcher der geförderte Kraftstoff in den Kraftstofftank gelangt, verringert wird, wird durch die Reduzierung des Betriebsmitteldrucks zusätzlich eine Reduzierung des in dem Kraftstofftank anfallenden gasförmigen Kraftstoff gegenüber aus dem Stand der Technik bekannten Kraftstoffsystemen erreicht. Besonders vorteilhaft ist die Betriebsmittelleitung mittels des Druckeinstellglieds vollständig verschließbar beziehungsweise unterbrechbar. Das bedeutet, dass die Saugstrahlpumpe auch bei laufender Kraftstoffpumpe außer Betrieb setzbar ist, so dass keine Förderung von flüssigem Kraftstoff aus dem Zwischenspeicher erfolgt. Auf diese Weise wird eine besonders deutliche Reduzierung des Energieverbrauchs des Kraftstoffsystems erreicht. Üblicherweise verfügt die Entlüftungseinrichtung über mindestens ein Entlüftungsventil zur Entlüftung des Kraftstofftanks durch die Entlüftungseinrichtung. Es kann nun vorgesehen sein, dass die Saugstrahlpumpe nur bei und/oder für eine bestimmte Zeitspanne nach einer Betätigung des Entlüftungsventils in Betrieb ist. Es wird demnach nur dann Kraftstoff aus dem Zwischenspeicher gefördert, während das Entlüften des Kraftstofftanks erfolgt und somit flüssiger Kraftstoff in den Zwischenspeicher anfallen kann.In addition, because the resource after passing through the ejector pump, possibly fed together with conveyed from the buffer liquid fuel back to the fuel tank and the pressure reduction, the speed at which the delivered fuel enters the fuel tank, is reduced, is reduced by the Betriebsmitteldrucks additionally achieves a reduction of the gaseous fuel accumulating in the fuel tank over fuel systems known in the art. Particularly advantageously, the operating medium line can be completely closed or interrupted by means of the pressure setting member. This means that the suction jet pump can be put out of operation even when the fuel pump is running, so that there is no delivery of liquid fuel from the buffer. In this way, a particularly significant reduction in the energy consumption of the fuel system is achieved. Usually, the venting device has at least one venting valve for venting the fuel tank through the venting device. It can now be provided that the suction jet pump is only in operation and / or for a certain period of time after actuation of the vent valve in operation. Accordingly, fuel is only conveyed from the intermediate store, while the fuel tank is vented, and thus liquid fuel can accumulate in the intermediate store.
Eine Weiterbildung der Erfindung sieht vor, dass der Kraftstofffördereinrichtung eine Betätigungseinrichtung, insbesondere mindestens einen Elektromagnet aufweisend, zugeordnet ist. Die Betätigungseinrichtung dient dem Betätigen der Kraftstofffördereinrichtung zur Förderung von Kraftstoff aus dem Zwischenspeicher. Die Betätigungseinrichtung ist bevorzugt eine elektrische Betätigungseinrichtung, welche unabhängig von der Kraftstoffpumpe des Kraftstoffsystems betreibbar ist. Die Betätigungseinrichtung kann dabei über mindestens einen Elektromagnet verfügen.A further development of the invention provides that the fuel delivery device is assigned an actuating device, in particular having at least one electromagnet. The actuating device serves to actuate the fuel delivery device for conveying fuel from the buffer. The actuating device is preferably an electrical actuating device which is operable independently of the fuel pump of the fuel system. The actuating device can have at least one electromagnet.
Eine Weiterbildung der Erfindung sieht vor, dass sowohl die Kraftstofffördereinrichtung als auch als auch ein Entlüftungsventil zur Entlüftung des Kraftstofftanks durch die Entlüftungseinrichtung von der Betätigungseinrichtung betätigbar sind, insbesondere getrennt voneinander oder gemeinsam. Das Entlüftungsventil ist dabei der Entlüftungseinrichtung zugeordnet. Das Entlüftungsventil kann derart eingestellt werden, dass es zur Entlüftung des Kraftstofftanks öffnet oder zur Unterbrechung der Entlüftung schließt. Es liegt beispielsweise als FTIV (Fuel Tank Isolation Valve) vor. Das Entlüftungsventil kann als Taktventil ausgebildet sein, welches ein Einstellen von diskreten Schaltzuständen (geöffnet und geschlossen) erlaubt. Besonders bevorzugt ist das Entlüftungsventil als Stetigventil ausgelegt, welches nicht lediglich die diskreten Schaltzustände zulässt, sondern ein Einstellen des Durchströmungsquerschnitts in mehreren Stufen, besonders bevorzugt ein stetiges Einstellen, ermöglicht. Auf diese Weise ist der Volumenstrom durch die Abscheidevorrichtung, insbesondere stetig, gesteuert und/oder geregelt einstellbar. Das Entlüftungsventil kann mit der Abscheidevorrichtung oder der Kraftstofffördereinrichtung integriert sein. Das Entlüftungsventil kann also modular in die Kraftstofffördereinrichtung integriert vorliegen.A development of the invention provides that both the fuel delivery device as well as a vent valve for venting of the fuel tank by the venting device be operated by the actuator, in particular separately or together. The vent valve is assigned to the venting device. The bleed valve may be adjusted to open the vent of the fuel tank or to close the vent. It is available, for example, as FTIV (Fuel Tank Isolation Valve). The vent valve may be formed as a clock valve, which allows setting of discrete switching states (open and closed). Particularly preferably, the vent valve is designed as a continuous valve, which not only allows the discrete switching states, but allows adjusting the flow cross-section in several stages, particularly preferably a continuous adjustment allows. In this way, the volume flow through the separation device, in particular continuously, controlled and / or regulated adjustable. The vent valve may be integrated with the separation device or the fuel delivery device. The vent valve can therefore be present modularly integrated into the fuel delivery device.
Sowohl die Kraftstofffördereinrichtung als auch das Entlüftungsventil sollen von der Betätigungseinrichtung betätigbar sein. Die Betätigungseinrichtung liegt insoweit als gemeinsame Betätigungseinrichtung vor, so dass eine einzige Betätigungseinrichtung ausreicht, um sowohl die Kraftstofffördereinrichtung als auch das Entlüftungsventil zu betätigen. Wie vorstehend bereits beschrieben, kann es vorgesehen sein, dass das Entlüftungsventil mit der Kraftstofffördereinrichtung integriert ist, also als gemeinsames Bauteil vorliegen. In diesem Fall ist bevorzugt auch eine Integration der Betätigungseinrichtung mit dem Entlüftungsventil und der Kraftstofffördereinrichtung vorgesehen. Die Betätigung kann dabei getrennt voneinander oder gemeinsam vorgesehen sein. In ersterem Fall kann mittels der Betätigungseinrichtung entweder die Kraftstofffördereinrichtung oder das Entlüftungsventil getrennt von dem jeweils anderen Element angesteuert werden. In letzterem Fall erfolgt mittels der Betätigungseinrichtung eine gleichzeitige Betätigung sowohl der Kraftstofffördereinrichtung als auch des Entlüftungsventils. Mit der gemeinsamen Betätigungseinrichtung kann demnach sowohl die Kraftstofffördereinrichtung zur Förderung von Kraftstoff aus dem Zwischenspeicher betätigt werden, als auch das Entlüften des Kraftstoffranks mittels des Entlüftungsventils bewirkt werden. Besonders bevorzugt ist hierbei die Integration von Kraftstofffördereinrichtung, Entlüftungsventil und Betätigungseinrichtung, weil somit mit einem einzigen Bauteil, welches zumindest bereichsweise in der Abscheidevorrichtung vorliegt, sowohl das Entlüften des Kraftstofftanks als auch das Entleeren des Zwischenspeichers möglich sind.Both the fuel delivery device and the venting valve should be operable by the actuator. The actuator is so far as a common actuator before, so that a single actuator is sufficient to actuate both the fuel conveyor and the vent valve. As already described above, it can be provided that the venting valve is integrated with the fuel delivery device, that is, as a common component. In this case, an integration of the actuating device with the vent valve and the fuel delivery device is preferably provided. The operation can be provided separately or together. In the former case, either the fuel delivery device or the venting valve can be controlled separately from the respective other element by means of the actuating device. In the latter case takes place by means of the actuating device, a simultaneous operation of both the fuel delivery device and the vent valve. Accordingly, both the fuel delivery device for conveying fuel from the buffer can be actuated with the common actuating device, as well as the venting of the fuel chamber are effected by means of the vent valve. Particularly preferred in this case is the integration of fuel delivery device, venting valve and actuating device, because thus with a single component, which is present at least partially in the separation device, both the venting of the fuel tank and the emptying of the buffer are possible.
Eine Weiterbildung der Erfindung sieht vor, dass die Betätigungseinrichtung zur Durchführung einer Betätigungsbewegung in eine erste Richtung und eine der ersten Richtung entgegengesetzte zweite Richtung und/oder um einen ersten Hub und um einen zweiten, größeren Hub ansteuerbar ist, wobei die Durchführung der Betätigungsbewegung in die erste Richtung oder um den ersten Hub die Kraftstofffördereinrichtung und/oder das Entlüftungsventil und die Durchführung der Betätigungsbewegung in die zweite Richtung oder um den zweiten Hub das Entlüftungsventil und/oder die Kraftstofffördereinrichtung betätigen. In einer ersten Ausführungsform ist die Betätigungseinrichtung demnach zur Durchführung der Betätigungsbewegung in zwei Richtungen und in einer zweiten Ausführungsform zur Durchführung der Betätigungsbewegung mit zwei unterschiedlichen Hüben vorgesehen. Dabei liegt eine Wirkverbindung zwischen der Betätigungseinrichtung und der Kraftstofffördereinrichtung sowie dem Entlüftungsventil derart vor, dass in Abhängigkeit von der Richtung oder dem Hub entweder die Kraftstofffördereinrichtung oder das Entlüftungsventil betätigt wird. Auf diese Weise kann die Betätigungseinrichtung als gemeinsame Betätigungseinrichtung sowohl für die Kraftstofffördereinrichtung als auch das Entlüftungsventil ausgebildet sein, jedoch ein getrenntes, also nicht gleichzeitiges, Betätigen von Kraftstofffördereinrichtung und Entlüftungsventil erlauben.A development of the invention provides that the actuating device for performing an actuating movement in a first direction and the first direction opposite second direction and / or a first stroke and a second, larger stroke is controlled, wherein the implementation of the actuating movement in the first direction or around the first stroke, the fuel delivery device and / or the vent valve and the implementation of the actuating movement in the second direction or the second stroke the vent valve and / or the fuel delivery device actuate. In a first embodiment, the actuating device is accordingly provided for carrying out the actuating movement in two directions and in a second embodiment for carrying out the actuating movement with two different strokes. In this case, there is an operative connection between the actuating device and the fuel delivery device and the venting valve such that either the fuel delivery device or the venting valve is actuated depending on the direction or the stroke. In this way, the actuator may be formed as a common actuator for both the fuel delivery device and the vent valve, but allow a separate, so not simultaneous, actuation of fuel delivery and vent valve.
Eine Weiterbildung der Erfindung sieht vor, dass als Betriebsmittel der Saugstrahlpumpe Kraftstoff aus dem Kraftstofftank vorgesehen ist, welcher mithilfe einer Kraftstoffpumpe in Richtung der Saugstrahlpumpe und eines Kraftstoffauslasses des Kraftstoffsystems förderbar ist. Die Kraftstoffpumpe dient demnach dazu, den Betriebsmitteldruck der Saugstrahlpumpe bereitzustellen. Die Kraftstoffpumpe und die Saugstrahlpumpe sind über die Betriebsmittelleitung miteinander strömungsverbunden. Das Druckminderungsglied oder das Druckeinstellglied liegen demnach strömungstechnisch zwischen der Kraftstoffpumpe und der Saugstrahlpumpe vor. Zusätzlich ist es üblicherweise vorgesehen, dass die Kraftstoffpumpe dazu dient, Kraftstoff in Richtung des Kraftstoffauslasses des Kraftstoffsystems zu fördern. Der Kraftstoffauslass ist beispielsweise einer Nutzmaschine, insbesondere der Brennkraftmaschine, zugeordnet.A development of the invention provides that fuel is provided from the fuel tank as operating means of the suction jet pump, which fuel can be conveyed by means of a fuel pump in the direction of the suction jet pump and a fuel outlet of the fuel system. The fuel pump therefore serves to provide the operating medium pressure of the suction jet pump. The fuel pump and the suction jet pump are fluidly connected to each other via the operating medium line. The pressure reducing member or the Druckeinstellglied are therefore fluidically in front of the fuel pump and the ejector. Additionally, it is usually envisioned that the fuel pump serves to deliver fuel toward the fuel outlet of the fuel system. The fuel outlet is associated, for example, with a utility machine, in particular with the internal combustion engine.
Eine Weiterbildung der Erfindung sieht vor, dass der Betrieb der Saugstrahlpumpe in einer ersten Betriebsart mit einem ersten Betriebsmitteldruck vorgesehen ist, welcher von einem zweiten Betriebsmitteldruck in einer zweiten Betriebsart unterschiedlich ist, wobei der Kraftstoff an einem Ausgang der Kraftstoffpumpe in der ersten und der zweiten Betriebsart mit dem zweiten Betriebsmitteldruck vorliegt. Der Kraftstoff wird demnach mittels der Kraftstoffpumpe aus dem Kraftstofftank gefördert und auf den zweiten Betriebsmitteldruck gebracht, welcher an dem Ausgang der Kraftstoffpumpe vorliegt. Üblicherweise wird der Kraftstoff an dem Kraftstoffauslass mit dem zweiten Betriebsmitteldruck für die Nutzmaschine bereitgestellt. Dagegen ist es vorgesehen, dass der Betriebsmitteldruck der Saugstrahlpumpe, also der erste Betriebsmitteldruck, von dem zweiten Betriebsmitteldruck abweicht, insbesondere niedriger ist.A development of the invention provides that the operation of the suction jet pump is provided in a first operating mode with a first operating medium pressure, which is different from a second operating medium pressure in a second operating mode, wherein the fuel at an output of the fuel pump in the first and the second mode present with the second operating medium pressure. The fuel is thus conveyed out of the fuel tank by means of the fuel pump and brought to the second operating medium pressure, which is present at the output of the fuel pump. Usually the fuel is provided at the fuel outlet at the second operating medium pressure for the utility machine. By contrast, it is provided that the operating medium pressure of the suction jet pump, ie the first operating medium pressure, deviates from the second operating medium pressure, in particular is lower.
Eine Weiterbildung der Erfindung sieht vor, dass das Druckminderungsglied oder das Druckeinstellglied strömungstechnisch zwischen dem Ausgang der Kraftstoffpumpe und der Saugstrahlpumpe vorgesehen ist. Die Druckminderung von dem an dem Ausgang der Kraftstoffpumpe vorliegenden zweiten Betriebsmitteldruck auf den zum Betrieb der Saugstrahlpumpe verwendeten ersten Betriebsmitteldruck soll demnach zwischen dem Ausgang der Kraftstoffpumpe und einem Betriebsmitteleinlass der Saugstrahlpumpe vorliegen.A further development of the invention provides that the pressure reducing member or the Druckeinstellglied is fluidly provided between the output of the fuel pump and the suction jet pump. The pressure reduction from the second operating medium pressure present at the outlet of the fuel pump to the first operating medium pressure used to operate the ejector pump should therefore be present between the output of the fuel pump and a working fluid inlet of the ejector pump.
Eine Weiterbildung der Erfindung sieht vor, dass das Druckminderungsglied eine Drossel oder das Druckeinstellglied ein Querschnittsverstellglied, insbesondere ein Kaskadenschalter, ist. Die Drossel soll dabei einen konstanten Durchströmungsquerschnitt aufweisen, während der Durchströmungsquerschnitt des Querschnittsverstellglieds einstellbar ist. Dabei ist es insbesondere auch vorgesehen, den Durchströmungsquerschnitt derart einzustellen, dass die Betriebsmittelleitung unterbrochen oder vollständig freigegeben ist. Das Querschnittsverstellglied kann dabei beispielsweise als Kaskadenschalter vorliegen. Dieser ist derart ausgebildet, dass er in Abhängigkeit von einem an einem Eingang anliegenden Druck, insbesondere dem zweiten Betriebsmitteldruck, einen bestimmten Durchströmungsquerschnitt freigibt beziehungsweise versperrt.A development of the invention provides that the pressure reducing member is a throttle or Druckeinstellglied a Querschnittsverstellglied, in particular a cascade switch is. The throttle should have a constant flow cross section, while the flow cross section of the Querschnittsverstellglieds is adjustable. In particular, it is also provided to adjust the flow cross-section such that the operating medium line is interrupted or completely released. The Querschnittsverstellglied can be present for example as a cascade switch. This is designed such that it releases or obstructs a specific flow cross-section as a function of a pressure applied to an input, in particular the second operating medium pressure.
Eine Weiterbildung der Erfindung sieht vor, dass das mindestens eine Entlüftungsventil zur Entlüftung des Kraftstofftanks durch die Abscheidevorrichtung dieser strömungstechnisch vorgeschaltet oder nachgeschaltet ist. Der Kraftstoff muss demnach für ein Durchströmen der Abscheidevorrichtung stets auch das Entlüftungsventil passieren. Bevorzugt ist das Entlüftungsventil der Abscheidevorrichtung strömungstechnisch nachgeschaltet, alternativ kann es dieser jedoch auch vorgeschaltet sein.A further development of the invention provides that the at least one venting valve for venting the fuel tank by the separating device is connected upstream or downstream of this. The fuel must therefore always pass through the vent valve for a flow through the separator. Preferably, the venting valve of the separation device downstream of flow, alternatively, however, it may be upstream of this.
Eine Weiterbildung der Erfindung sieht vor, dass der Abscheidevorrichtung zumindest ein in Abhängigkeit des Kraftstofftankfüllstands schaltendes Belüftungsventil und/oder zumindest ein dem Kraftstofftank zugeordnetes Sicherheitsventil strömungstechnisch vorgeschaltet sind. Das Belüftungsventil ist insbesondere als FLVV (Fill Limit Venting Valve) ausgebildet. Ein solches ermöglicht ein Belüften des Kraftstofftanks, solange der Kraftstofftankfüllstand kleiner ist als ein bestimmter Kraftstofftankfüllstand, insbesondere Kraftstofftankmaximalfüllstand. Über das Belüftungsventil wird somit das Belüften des Kraftstofftanks, insbesondere bei einem Zuführen von Kraftstoff in den Kraftstofftank, sichergestellt. Zusätzlich oder alternativ kann das Sicherheitsventil vorgesehen sein, welches beispielsweise als Überroll-Sicherheitsventil beziehungsweise ROV (Roll Over Valve) ausgebildet ist. Sowohl das Belüftungsventil als auch das Sicherheitsventil sind üblicherweise dem Kraftstofftank zugeordnet und der Abscheidevorrichtung strömungstechnisch vorgeschaltet, so dass der Kraftstoff zunächst das Belüftungsventil beziehungsweise das Sicherheitsventil durchläuft, bevor es in die Abscheidevorrichtung gelangt.A further development of the invention provides that the separation device is preceded by at least one ventilation valve switching in dependence on the fuel tank level and / or at least one safety valve associated with the fuel tank. The ventilation valve is designed in particular as FLVV (Fill Limit Venting Valve). Such allows venting of the fuel tank as long as the fuel tank level is less than a particular fuel tank level, in particular Fuel tank maximum level. The ventilation valve thus ensures ventilation of the fuel tank, in particular when fuel is supplied to the fuel tank. Additionally or alternatively, the safety valve may be provided, which is designed for example as a rollover safety valve or ROV (roll over valve). Both the ventilation valve and the safety valve are usually associated with the fuel tank and upstream of the separation device, so that the fuel first passes through the ventilation valve or the safety valve before it enters the separation device.
Die Erfindung betrifft auch ein Antriebssystem mit einem Kraftstoffsystem gemäß den vorstehenden Ausführungen. Das Antriebssystem verfügt dabei insbesondere über zumindest eine Brennkraftmaschine und ist beispielsweise als Hybridantriebssystem ausgebildet.The invention also relates to a drive system with a fuel system according to the above. The drive system in particular has at least one internal combustion engine and is designed, for example, as a hybrid drive system.
Die Erfindung wird nachfolgend anhand der in der Zeichnung dargestellten Ausführungsbeispiele näher erläutert, ohne dass eine Beschränkung der Erfindung erfolgt. Dabei zeigen:
Figur 1- eine schematische Darstellung eines Kraftstoffsystems in einer ersten Ausführungsform,
Figur 2- das Kraftstoffsystem in einer zweiten Ausführungsform, und
Figur 3- ein Druckeinstellglied des Kraftstoffsystems.
- FIG. 1
- a schematic representation of a fuel system in a first embodiment,
- FIG. 2
- the fuel system in a second embodiment, and
- FIG. 3
- a pressure adjusting member of the fuel system.
Die
Die Entlüftungseinrichtung 3 steht über eine Entlüftungsleitung 7 in Strömungsverbindung mit dem Kraftstofftank 2. Auf der dem Kraftstofftank 2 zugewandten Seite der Entlüftungsleitung 7 beziehungsweise in dem Kraftstofftank 2 ist dabei ein Belüftungsventil 8 vorgesehen, welches in Abhängigkeit des Kraftstofftankfüllstands schaltet. Üblicherweise ist das Belüftungsventil 8 derart ausgeführt, dass es nur bei einem Kraftstofftankfüllstand unterhalb eines bestimmten Kraftstofftankfüllstands, insbesondere eines Maximalkraftstofftankfüllstands, geöffnet ist, also Kraftstoff, insbesondere gasförmiger Kraftstoff, aus dem Kraftstofftank in die Entlüftungsleitung 7 gelangen kann. Die Entlüftungsleitung 7 mündet in den Zwischenspeicher 5 der Abscheidevorrichtung 4 ein, bevorzugt durch einen Boden 9 des Zwischenspeichers 5. Beabstandet von der Entlüftungsleitung 7 beziehungsweise deren Mündungsstelle in den Zwischenspeicher 5 mündet eine Auslassleitung 10 in den Zwischenspeicher 5 ein, bevorzugt durch eine Decke 11 des Zwischenspeichers 5. Die Mündungsstelle der Auslassleitung 10 in den Zwischenspeicher 5 ist damit bevorzugt derart angeordnet, dass lediglich gasförmiger Kraftstoff aus dem Zwischenspeicher 5 in die Auslassleitung 10 gelangen kann. Dazu sind die Mündungsstellen von Auslassleitung 10 und Entlüftungsleitung 7 bevorzugt an gegenüberliegenden Seiten des Zwischenspeichers 5 angeordnet. Die Auslassleitung 10 weist ein Entlüftungsventil 12 auf, welches mittels einer Betätigungseinrichtung 13 betätigbar ist. Das Entlüftungsventil 12 und die Betätigungseinrichtung 13 sind dabei bevorzugt derart ausgebildet, dass der Durchströmungsquerschnitt des Entlüftungsventils 12 stetig einstellbar ist. Auf der der Abscheidevorrichtung 4 abgewandten Seite mündet die Auslassleitung 10 in einen Kraftstoffspeicher 14, insbesondere einen Aktivkohlespeicher, ein. Der Kraftstoffspeicher 14 dient der Zwischenspeicherung von gasförmigem Kraftstoff.The
Die Abscheidevorrichtung 4 ist üblicherweise zumindest bereichsweise, insbesondere vollständig, in dem Kraftstofftank 2, angeordnet. Auch eine Anordnung außerhalb des Kraftstofftanks 2 ist jedoch möglich. Alternativ kann die Abscheidevorrichtung 4 auch in eine Leitung, beispielsweise die Entlüftungsleitung 7, integriert sein. In einer bevorzugten Ausführungsform ist die Abscheidevorrichtung derart ausgebildet, dass sie beziehungsweise die Entlüftungseinrichtung 3 einen bestimmten Druckverlust aufweist. Dieser ist dabei derart gewählt, dass bei einem Entlüften der Kraftstofftanks 2 mittels der Entlüftungseinrichtung 3 ein eventuell vorhandenes Ventil, beispielsweise das Belüftungsventil 8, nicht in dessen Geschlossenstellung gebracht wird. Das Belüftungsventil 8 weist üblicherweise einen Schwimmer auf, welcher einen Ventilsitz des Belüftungsventils 8 freigibt, solange der Kraftstofftankfüllstand kleiner als ein bestimmter Kraftstofftankfüllstand ist. Wird der mittels der Entlüftungseinrichtung 3, also durch das Belüftungsventil 8, abgeführte Volumenstrom größer als ein Auslegungsvolumenstrom, so kann der Schwimmer von dem Volumenstrom beziehungsweise dem entlüfteten Kraftstoff in den Ventilsitz, also in die Geschlossenstellung verlagert werden, so dass ein weiteres Entlüften des Kraftstofftanks 2 nicht möglich ist. Dies gilt insbesondere bei vollständig geöffnetem Entlüftungsventil 12.The separation device 4 is usually at least partially, in particular completely, arranged in the
Üblicherweise wird der Druckverlust der Entlüftungseinrichtung 3 durch Anpassen des Entlüftungsventils 12 eingestellt, beispielsweise durch Einbringen eines Drosselelements. Hier soll es nun bevorzugt vorgesehen sein, dass der Druckverlust der Entlüftungseinrichtung 3 durch Anpassen der Abscheidevorrichtung 4 beziehungsweise deren Druckverlust erfolgt, beispielsweise durch Vorsehen eines angepassten Drosselelements. Das Entlüftungsventil 12 weist demnach bevorzugt kein Drosselelement auf. Das Drosselelement kann jedoch selbstverständlich zusätzlich vorgesehen sein.Usually, the pressure loss of the
Um Kraftstoff aus dem Zwischenspeicher 5 in Richtung des Kraftstofftanks 2 zu fördern, weist die Abscheidevorrichtung 4 eine Kraftstofffördereinrichtung 15 auf, welche als Saugstrahlpumpe 16 ausgebildet ist. Die Saugstrahlpumpe 16 weist eine Betriebsmittelleitung 17 und Ansaugleitung 18 auf. Bei einem Betrieb der Saugstrahlpumpe 16 wird die Betriebsmittelleitung 17 von Betriebsmittel durchströmt. Die Saugleitung 18 mündet dabei in einem Bereich in die Betriebsmittelleitung 17 ein, in welchem letztere einen abschnittsweise verringerten Querschnitt aufweist, so dass beispielsweise eine Venturidüse vorliegt. Die Saugleitung 18 mündet in den Zwischenspeicher 5 derart ein, dass ihre Mündung in einem Bereich angeordnet ist, in welchem üblicherweise flüssiger Kraftstoff in dem Zwischenspeicher 5 vorliegt. Die Mündung der Saugleitung 18 wird demnach üblicherweise im Bereich des Bodens 9 angeordnet sein. Die Betriebsmittelleitung 17 ist an eine Kraftstoffpumpe 19 angeschlossen, welche dem Kraftstofftank 2 zugeordnet ist und der Förderung von Kraftstoff aus dem Kraftstofftank 2 dient. Üblicherweise ist die Kraftstoffpumpe 19 dazu vorgesehen, den Kraftstoff sowohl in Richtung eines Kraftstoffauslasses 20 des Kraftstoffsystems 1 als auch in Richtung der Saugstrahlpumpe 16 zu fördern. Sowohl die Betriebsmittelleitung 17 als auch der Kraftstoffauslass sind demnach strömungstechnisch mit einem Ausgang 21 der Kraftstoffpumpe 19 verbunden.In order to convey fuel from the
In der Betriebsmittelleitung 17 ist ein Druckeinstellglied 22 vorgesehen, welches entweder als diskretes Ventil oder als Stetigventil vorliegen kann. Das Druckeinstellglied 23 liegt insofern als Querschnittsverstellglied vor. Das Druckeinstellglied 22 dient dazu, die Betriebsmittelleitung 17 zu unterbrechen oder für eine Durchströmung mit dem von der Kraftstoffpumpe 19 geförderten Kraftstoff freizugeben. Ist das Druckeinstellglied 23 als Stetigventil ausgebildet, so kann es zusätzlich vorgesehen sein, dass ein erster, an der Saugstrahlpumpe 16 anliegender Betriebsmitteldruck gesteuert und/oder geregelt einstellbar ist, während an dem Ausgang 21 der Kraftstoffpumpe 19 ein zweiter Betriebsmitteldruck vorliegt. Der erste Betriebsmitteldruck kann in Abhängigkeit von dem an dem Ausgang 21 vorliegenden Druck und/oder dem Kraftstofftankinnendruck gewählt sein.In the
In der in der
Die
Die
- 11
- KraftstoffsystemFuel system
- 22
- KraftstofftankFuel tank
- 33
- EntüftungseinrichtungEntüftungseinrichtung
- 44
- Abscheidevorrichtungseparating
- 55
- Zwischenspeichercache
- 66
- RückfhrungsleitungRückfhrungsleitung
- 77
- EntütungsteitungEntütungsteitung
- 88th
- BeüftungsventilBeüftungsventil
- 99
- Bodenground
- 1010
- Auslassleitungoutlet pipe
- 1111
- Deckeblanket
- 1212
- EntüftungsventilEntüftungsventil
- 1313
- BefätigungseinrichtungBefätigungseinrichtung
- 1414
- KraftstoffspeicherFuel storage
- 1515
- Kraftstoffördereinrichtungfuel delivery
- 1616
- Saugstrahlpumpeeductor
- 1717
- BetriebsmittelleitungResource management
- 1818
- Saugleitungsuction
- 1919
- KraftstoffpumpeFuel pump
- 2020
- Kraftstoffauslassfuel outlet
- 2121
- Ausgangoutput
- 2222
- DruckeinstellgliedDruckeinstellglied
- 2323
- Kaskadenschaltercascade switch
- 2424
- Zylindercylinder
- 2525
- Kolbenpiston
- 2626
- Eingangentrance
- 2727
- Federfeather
- 2828
- Ausnehmungrecess
- 2929
- Erste KammerFirst chamber
- 3030
- Zweite KammerSecond Chamber
- 3131
- Ausgangoutput
- 3232
- DurchstömungsquerschnittDurchstömungsquerschnitt
Claims (10)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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DE201010055317 DE102010055317A1 (en) | 2010-12-21 | 2010-12-21 | Fuel system |
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EP2468560A1 true EP2468560A1 (en) | 2012-06-27 |
EP2468560B1 EP2468560B1 (en) | 2013-07-03 |
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EP20110009838 Active EP2468560B1 (en) | 2010-12-21 | 2011-12-14 | Fuel system |
Country Status (5)
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US (1) | US8955496B2 (en) |
EP (1) | EP2468560B1 (en) |
CN (1) | CN102529699B (en) |
DE (1) | DE102010055317A1 (en) |
ES (1) | ES2423835T3 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
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DE102011106008B4 (en) | 2011-06-30 | 2018-10-31 | Audi Ag | Method of operating a fuel system and fuel system |
DE102011106006B4 (en) | 2011-06-30 | 2019-05-16 | Audi Ag | Method of operating a fuel system and fuel system |
DE102013203994A1 (en) * | 2013-03-08 | 2014-09-11 | Ti Automotive Technology Center Gmbh | Fuel tank with pneumatically emptied liquid separator |
DE102015012656A1 (en) | 2014-10-22 | 2016-04-28 | Audi Ag | Method for operating a fuel system for a motor vehicle and corresponding fuel system |
DE102015005754A1 (en) | 2015-05-05 | 2016-11-10 | Audi Ag | Solenoid valve device for a motor vehicle |
DE102015010354B4 (en) | 2015-08-06 | 2017-03-16 | Audi Ag | Operating fluid tank arrangement for a motor vehicle |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2007031466A1 (en) * | 2005-09-14 | 2007-03-22 | Siemens Vdo Automotive Ag | Ventilation device for a fuel container |
Family Cites Families (16)
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GB2217388B (en) * | 1988-04-11 | 1992-11-18 | Outboard Marine Corp | Vapour separator |
JPH08121278A (en) * | 1994-10-19 | 1996-05-14 | Sanshin Ind Co Ltd | Fuel supplying device for engine |
US5579740A (en) * | 1995-01-20 | 1996-12-03 | Walbro Corporation | Fuel handling system |
US6622708B2 (en) * | 1999-03-19 | 2003-09-23 | Delphi Technologies, Inc. | Priming fuel system method and apparatus for marine engines |
US6273937B1 (en) * | 2000-03-29 | 2001-08-14 | Trans Ionics Corporation | Membrane pervaporation and vapor permeation system |
DE10063414A1 (en) | 2000-12-19 | 2002-06-27 | Kautex Textron Gmbh & Co Kg | Fuel tank |
FR2844487B1 (en) * | 2002-09-13 | 2005-05-13 | Inergy Automotive Systems Res | SAFETY SYSTEM FOR LIQUID FUEL TANK |
US6887300B2 (en) * | 2003-01-24 | 2005-05-03 | Cms Technology Holdings, Inc. | Cyclic membrane separation process |
DE10342081B4 (en) | 2003-09-10 | 2006-08-10 | Siemens Ag | Fuel tank for a motor vehicle |
EP1518739A3 (en) | 2003-09-29 | 2005-11-30 | Alfmeier Präzision Ag Baugruppen und Systemlösungen | Vehicle tank including a venting system |
DE102005000731A1 (en) | 2005-01-04 | 2006-07-13 | Siemens Ag | Fuel supply system for a motor vehicle |
EP1893864B1 (en) * | 2005-06-21 | 2009-03-11 | Daimler AG | Fuel supply device |
DE102007043522B4 (en) | 2007-09-12 | 2022-04-14 | Bayerische Motoren Werke Aktiengesellschaft | Switch-off device for a suction jet pump, in particular in a fuel tank of a motor vehicle |
DE102008026734A1 (en) | 2008-06-04 | 2009-12-10 | Continental Aktiengesellschaft | Pumping device for conveying fuel in a fuel tank |
JP5154507B2 (en) * | 2009-05-18 | 2013-02-27 | 愛三工業株式会社 | Evaporative fuel processing equipment |
KR20130139986A (en) * | 2011-01-20 | 2013-12-23 | 페더럴-모걸 코오포레이숀 | Fuel level sensor for marine fuel vapor separator external to unit |
-
2010
- 2010-12-21 DE DE201010055317 patent/DE102010055317A1/en not_active Ceased
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2011
- 2011-12-14 ES ES11009838T patent/ES2423835T3/en active Active
- 2011-12-14 EP EP20110009838 patent/EP2468560B1/en active Active
- 2011-12-16 US US13/328,343 patent/US8955496B2/en active Active
- 2011-12-21 CN CN201110433234.1A patent/CN102529699B/en active Active
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007031466A1 (en) * | 2005-09-14 | 2007-03-22 | Siemens Vdo Automotive Ag | Ventilation device for a fuel container |
Also Published As
Publication number | Publication date |
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ES2423835T3 (en) | 2013-09-24 |
CN102529699B (en) | 2016-02-10 |
DE102010055317A1 (en) | 2012-06-21 |
CN102529699A (en) | 2012-07-04 |
US20120180767A1 (en) | 2012-07-19 |
EP2468560B1 (en) | 2013-07-03 |
US8955496B2 (en) | 2015-02-17 |
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